package model;



import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;


public class DBUtil {
    private volatile static DataSource dataSource = null ;

    // 使用单例模式对 DataSource进行封装 ;
    private static DataSource getDataSource(){
        if(dataSource == null){
            synchronized(DBUtil.class){
                if(dataSource == null){
                    dataSource = new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setUrl("jdbc:mysql://127.0.0.1:3306/blog_system?characterEncoding=utf8&useSSL=false");
                    ((MysqlDataSource)dataSource).setUser("root");
                    ((MysqlDataSource)dataSource).setPassword("0118");
                }
            }
        }
        return dataSource;
    }
    // 建立连接方法
    public static Connection getConnection() throws SQLException {
        return getDataSource().getConnection();
    }
    // 关闭资源的方法
     public static void close(Connection connection , PreparedStatement preparedStatement, ResultSet resultSet){
         if(resultSet != null){
             try{
                 resultSet.close();
             } catch (SQLException e) {
                 throw new RuntimeException(e);
             }
         }
         if (preparedStatement != null){
             try{
                 preparedStatement.close();
             } catch (SQLException e) {
                 throw new RuntimeException(e);
             }
         }
         if(connection != null){
             try{
                 connection.close();
             } catch (SQLException e) {
                 throw new RuntimeException(e);
             }
         }

     }

}
